Looks to me like the 91XG will be used as a dedicated antenna for WOAY 50. Read and understand this
http://forum.tvfool.com/showthread.php?t=695 Also how much do the NM(dB) numbers improve for WFRX Fox , WPXR Ion , WDBJ CBS with a higher antenna ? . 0 NM(dB) is the FCC number for reliable reception of LOS Line Of Sight between the transmitting antenna and receiving antenna. This is a target number and is not chiseld in stone. Reception drops off fast below -10 so the more toward the positive the numbers the better.